CN111927634B - Bearing chamber non-contact graphite sealing structure - Google Patents
Bearing chamber non-contact graphite sealing structure Download PDFInfo
- Publication number
- CN111927634B CN111927634B CN202010842892.5A CN202010842892A CN111927634B CN 111927634 B CN111927634 B CN 111927634B CN 202010842892 A CN202010842892 A CN 202010842892A CN 111927634 B CN111927634 B CN 111927634B
- Authority
- CN
- China
- Prior art keywords
- groove
- sealing
- dynamic pressure
- fishbone
- graphite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 231
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 121
- 239000010439 graphite Substances 0.000 title claims abstract description 121
- 239000010687 lubricating oil Substances 0.000 claims abstract description 18
- 230000002441 reversible effect Effects 0.000 claims description 10
- 230000003068 static effect Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 230000008093 supporting effect Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/28—Arrangement of seals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/06—Arrangements of bearings; Lubricating
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a non-contact graphite sealing structure of a bearing cavity, relates to the field of engine bearing cavity sealing, and is particularly suitable for efficient sealing of lubricating oil of the bearing cavity of an aeroengine. Aiming at the defects of high friction power consumption, high friction heat, low working linear speed and the like of the contact type graphite seal, the invention reduces the contact area of a rotor and a stator by arranging the inverse fishbone type dynamic pressure groove on the inner circumferential surface of the graphite seal ring and arranging the fishbone type dynamic pressure groove on the outer circumferential surface of the seal runway. The method is simple and clear, is easy to realize, and is a sealing structure with a good application prospect.
Description
Technical Field
The invention belongs to the field of bearing cavity sealing, and relates to a non-contact graphite sealing structure suitable for an aeroengine bearing cavity and the like. The structure is characterized in that a reverse fishbone-shaped dynamic pressure groove is formed in the inner circumferential surface of the graphite sealing ring pair seal and a fishbone-shaped dynamic pressure groove is formed in the outer circumferential surface of the sealing runway, the sealing performance is improved, meanwhile, the graphite seal tends to be non-contact through reducing the contact area and improving the supporting force, and the sealing requirement of a modern high-performance aero-engine on bearing cavity lubricating oil is met.
Background
For modern high-performance aircraft engines, there is a constant need to break through sealing technology in pursuit of higher thrust-to-weight ratio and thermal efficiency, reduced fuel consumption, controlled pollutant emissions and improved operating life. Research shows that the thrust of the engine can be increased by 1% and the oil consumption can be reduced by 0.1% when the sealing leakage amount is reduced by 1%. The graphite seal is a contact type sealing structure, has better integral sealing performance than non-contact type seal, and is generally used for sealing lubricating oil in a bearing cavity.
Firstly, the performance requirements such as allowable material temperature, material hardness and the like are limited, the working range of graphite sealing is limited, and the running linear velocity of the graphite sealing is generally not more than 150 m/s; secondly, the main sealing surface of the graphite seal is generally small in size, and the seal is easy to fail if damaged in the high-speed operation process; and thirdly, as the graphite seal belongs to a contact seal, the size of a secondary seal surface is larger, so that the friction power consumption and the friction heat are high, the abrasion is serious, and the service life of the graphite seal is wholly shorter than that of a non-contact seal structure.
Aiming at the defects caused by contact, the invention provides a graphite sealing non-contact design method, and the graphite sealing structure is improved by using the method, the whole structure is simpler, the processing difficulty is not different from that of the traditional sealing structure, but the sealing performance and the service life are greatly improved, and the graphite sealing non-contact design method has wide application prospect.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides a non-contact graphite sealing structure of a bearing cavity, which is particularly suitable for non-contact graphite sealing of the bearing cavity of an aeroengine.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a bearing cavity non-contact graphite sealing structure is suitable for sealing lubricating oil in an engine bearing cavity, at least one axial end part of the engine bearing cavity is provided with a graphite sealing assembly, the graphite sealing assembly comprises a sealing runway and a graphite sealing ring matched with the sealing runway, the sealing runway is fixedly sleeved on a rotating shaft, the graphite sealing ring is arranged in a static mounting seat and sleeved on the sealing runway, and the inner circumferential surface of the graphite sealing ring is tightly attached to the outer circumferential surface of the sealing runway to form an axial sealing surface; it is characterized in that the preparation method is characterized in that,
an annular inner groove which is close to the engine bearing cavity in the axial direction is formed in the inner circumferential surface of the graphite sealing ring, the inner circumferential surface of the graphite sealing ring is divided into a main sealing surface which is close to the engine bearing cavity and a secondary sealing surface which is far away from the engine bearing cavity in the axial direction by the annular inner groove, and the axial width of the secondary sealing surface is far greater than that of the main sealing surface; a circle of anti-fishbone-shaped dynamic pressure grooves which are uniformly arranged at intervals along the circumferential direction and have the same orientation are formed in the secondary sealing surface, each anti-fishbone-shaped dynamic pressure groove comprises a left side groove and a right side groove which are communicated with each other and have included angles, each anti-fishbone-shaped dynamic pressure groove comprises a head region, a middle region and a tail region, the tail region of the left side groove is communicated with the outside of the bearing cavity of the engine, the tail region of the right side groove is communicated with the annular inner groove, and the orientation of the head region of each anti-fishbone-shaped dynamic pressure groove is opposite to the rotation direction omega of the rotating shaft;
the outer circumferential surface of the sealing runway is provided with at least one circle of fishbone-shaped grooves which are uniformly arranged at intervals along the circumferential direction and have the same orientation, the fishbone-shaped dynamic pressure grooves are arranged in the axial direction corresponding to the anti-fishbone-shaped dynamic pressure grooves, each fishbone-shaped groove comprises a left side groove and a right side groove which are communicated with each other and have included angles, each fishbone-shaped dynamic pressure groove comprises a head area, a middle area and a tail area, and the orientation of the head area of each fishbone-shaped dynamic pressure groove is the same as the rotation direction omega of the rotation shaft.
Preferably, the engine bearing cavity is provided with a bearing rotating at high speed and filled with lubricating oil for lubricating and cooling the bearing.
Preferably, at least one circumferential elastic member is arranged in the static mounting seat, and the circumferential elastic member abuts against the outer circumferential surface of the graphite sealing ring, so that the inner circumferential surface of the graphite sealing ring is arranged in a manner of abutting against the outer circumferential surface of the sealing track to form an axial sealing surface.
Preferably, the static mounting seat is further provided with an axial elastic piece, and the axial elastic piece is abutted on the axial end face of one side of the graphite sealing ring, so that the axial end face of the other side of the graphite sealing ring is tightly arranged with the radial extending surface of the static mounting seat to form a radial sealing surface.
Preferably, a sealing cavity is arranged outside the engine bearing cavity, and the pressure of sealing gas in the sealing cavity is higher than the pressure of lubricating oil in the engine bearing cavity, so that the lubricating oil in the engine bearing cavity can be further prevented from leaking to the outside; and the tail area of the left groove of each anti-fishbone dynamic pressure groove is communicated with the sealing cavity, and the tail area of the right groove is communicated with the annular inner groove.
Preferably, in each of the inverse fishbone-shaped dynamic pressure grooves, an included angle α between the left groove and the right groove1Between 100 and 170 degrees, and is generally 150 degrees.
Preferably, the included angle β between two adjacent anti-fishbone dynamic pressure grooves in the circumferential direction1Is 3-8 degrees.
Preferably, in each of the anti-fishbone-shaped dynamic pressure generating grooves, the width t of the anti-fishbone-shaped dynamic pressure generating groove10.4-1 mm, depth h1The radius R of the head region of the inverse fishbone dynamic pressure groove is between 0.3 and 0.6mm1In the range of 1-6 mm, the tail area of the left side groove is communicated with the engine sealing cavity, the tail area of the right side groove is communicated with the annular inner groove of the graphite sealing ring, and the middle area is a straight groove or a curved groove.
Preferably, in each fishbone-shaped groove, the included angle alpha between the left groove and the right groove2Between 90 and 150 degrees, and is generally 120 degrees.
Preferably, the included angle beta of two adjacent fishbone-shaped grooves in the circumferential direction2Is 5 to 12 degrees.
Preferably, in each fishbone-shaped groove, the width t of the fishbone-shaped groove20.1-0.6 mm, depth h2The radius R of the head area of the fishbone-shaped groove is between 0.01 and 0.1mm21At 2-6 mm, tail area radius R22The middle area is a straight groove or a curved groove with the thickness of 0.5-3 mm.
The invention relates to a bearing cavity non-contact graphite sealing structure, which comprises a graphite sealing ring non-contact design and a runway non-contact design, and is mainly characterized in that: according to the non-contact design of the graphite sealing ring, anti-fishbone dynamic pressure grooves are uniformly formed in the secondary sealing surface of the graphite sealing ring and comprise a left side groove and a right side groove, and each anti-fishbone dynamic pressure groove consists of a head part, a middle part and a tail part; according to the non-contact design of the sealing track, fishbone-shaped dynamic pressure grooves are uniformly formed in the outer circumferential surface of the sealing track and comprise a left side groove and a right side groove, and each fishbone-shaped dynamic pressure groove consists of a head part, a middle part and a tail part; after the dynamic pressure grooves are respectively formed in the surfaces of the graphite sealing ring and the sealing runway, the contact area between the graphite sealing ring and the sealing runway is reduced, and under the action of the pressure in the dynamic pressure grooves, the supporting force of the sealing runway on the graphite sealing ring is increased, so that the graphite sealing ring and the sealing runway tend to be in non-contact integrally.
When the graphite seal works, the graphite seal ring is matched with the seal track for use. Under the working state of the engine, the graphite sealing ring keeps a static state all the time, the sealing runway rotates along with the rotating shaft, relative friction is generated between the graphite sealing ring and the sealing runway, and the pressure of sealing gas in the sealing cavity is higher than that of lubricating oil in the bearing cavity, so that the sealing effect is generated on the lubricating oil, and the lubricating oil is prevented from leaking.
When the engine stably runs, the anti-fishbone dynamic pressure groove is formed in the secondary sealing surface of the graphite sealing ring, so that the contact area between the graphite sealing ring and the sealing runway is reduced, and the graphite sealing ring and the sealing runway tend to be in non-contact. When the engine runs stably, the fishbone dynamic pressure groove is formed in the outer circumferential surface of the sealing runway, so that the contact area between the graphite sealing ring and the runway is reduced, and the graphite sealing ring and the sealing runway tend to be in non-contact. When the engine runs stably, because the vice sealed face of graphite sealing ring has seted up anti-fishbone type dynamic pressure groove, under anti-fishbone type dynamic pressure inslot pressure effect, the graphite sealing ring has the trend that breaks away from the runway for graphite sealing ring and sealed runway tend to non-contact. When the engine runs stably, the fishbone-shaped dynamic pressure groove is formed in the outer circumferential surface of the sealing runway, and the graphite sealing ring tends to be separated from the sealing runway under the action of pressure in the fishbone-shaped dynamic pressure groove, so that the graphite sealing ring and the sealing runway tend to be in non-contact.
According to the bearing cavity non-contact graphite sealing structure, the graphite sealing ring and the sealing runway are in non-contact design, so that the abrasion of the graphite sealing ring and the sealing runway is weakened, and the service life of graphite sealing is prolonged. The graphite sealing ring and the sealing runway are in non-contact design, so that the friction heat and the friction power consumption are reduced, the linear speed of the graphite sealing is improved, and the use boundary of the graphite sealing is widened.
Compared with the prior art, the bearing cavity non-contact graphite sealing structure provided by the invention has the advantages that various performances are improved, and the performances are shown as follows: 1) the structure is simple, the layout is reasonable, the processing is convenient, and the cost is controllable; 2) the sealing performance is improved by supplementing pressure through the dynamic pressure groove under the condition of not increasing the sealing air volume; 3) the friction contact area between the graphite sealing ring and the sealing runway is reduced, the friction power consumption and the friction heat are reduced, the linear speed of operation can be further improved, and the use boundary of the graphite sealing is widened; 4) the friction contact area between the graphite sealing ring and the sealing runway is reduced, the abrasion is weakened, and the service life is prolonged.
Drawings
FIG. 1 is a schematic view of a bearing cavity non-contact graphite containment structure of the present invention;
FIG. 2 is a schematic structural view of a graphite sealing ring with a reversed fishbone-shaped dynamic pressure groove;
FIG. 3 is a partially enlarged view of the dynamic pressure generating groove of the reverse fishbone type;
FIG. 4 is a schematic view of a sealing track structure with a fishbone-type dynamic pressure groove;
FIG. 5 is a partially enlarged view of the dynamic pressure generating groove of fishbone type;
FIG. 6 is a cross-sectional view of the graphite sealing ring and the sealing race and the rotating shaft;
in the figure: 1. the sealing structure comprises a rotating shaft, 2 parts of a sealing cavity, 3 parts of a sealing runway, 4 parts of a graphite sealing ring, 5 parts of an axial elastic part, 6 parts of an elastic retainer ring, 7 parts of a baffle plate, 8 parts of a circumferential elastic part, 9 parts of a static mounting seat, 10 parts of an engine bearing cavity, 11 parts of a bearing, 12 parts of sealing gas, 13 parts of lubricating oil, 14 parts of a reverse fishbone type dynamic pressure groove, 15 parts of a left side groove, 16 parts of a right side groove, 17 parts of a head part, 18 parts of a middle part, 19 parts of a tail part, 20 parts of a fishbone type dynamic pressure groove, 21 parts of the left side groove, 22 parts of the right side groove, 23 parts of the head part, 24 parts of the middle part, 25 parts of the tail part, 26 parts of a main sealing surface, 27 parts of an annular inner groove and 28 parts of an auxiliary sealing surface.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The structure and technical scheme of the present invention are further described in detail with reference to the accompanying drawings, and an embodiment of the present invention is provided.
The present invention is a non-contacting graphite seal structure suitable for use in the engine bearing cavity shown in fig. 1. According to the above structure, the graphite seal ring 4 shown in fig. 2 and the seal raceway 3 shown in fig. 3 are designed. The inner circumferential surface of the graphite sealing ring 4 is provided with a reverse fishbone dynamic pressure groove 14, and the outer circumferential surface of the sealing runway 3 is provided with a fishbone dynamic pressure groove 20.
Specifically, in the non-contact graphite sealing structure of the bearing cavity of the invention, a bearing 11 rotating at high speed is arranged in an engine bearing cavity 10, lubricating oil 13 for lubricating and cooling the bearing 11 is filled in the engine bearing cavity, and a graphite sealing assembly is arranged at the axial end part of the engine bearing cavity 10. The graphite sealing assembly comprises a sealing runway 3 and a graphite sealing ring 4 matched with the sealing runway 3 for use, the sealing runway 3 is fixedly sleeved on the rotating shaft 1, the graphite sealing ring 4 is arranged in a static mounting seat 9, the graphite sealing ring 4 is sleeved on the sealing runway 3, and the inner circumferential surface of the graphite sealing ring 4 is tightly attached to the outer circumferential surface of the sealing runway 3 to form an axial sealing surface.
As shown in fig. 2 and 3, in the non-contact graphite sealing structure for a bearing cavity of the present invention, an annular inner groove 27 is formed on the inner circumferential surface of the graphite sealing ring 4, which is close to the engine bearing cavity 10 in the axial direction, the annular inner groove 27 divides the inner circumferential surface of the graphite sealing ring 4 into a primary sealing surface 26 close to the engine bearing cavity 10 and a secondary sealing surface 28 far away from the engine bearing cavity in the axial direction, and the axial width of the secondary sealing surface 28 is much greater than the axial width of the primary sealing surface 26; the secondary sealing surface 28 is provided with a circle of anti-fishbone dynamic pressure grooves 14 which are uniformly arranged at intervals along the circumferential direction and have the same orientation, each anti-fishbone dynamic pressure groove 14 comprises a left side groove 15 and a right side groove 16 which are communicated with each other and have included angles, each anti-fishbone dynamic pressure groove 14 comprises a head region 17, a middle region 18 and a tail region 19, wherein the tail region 19 of the left side groove 15 is communicated with the outside of the engine bearing cavity 10, the tail region 19 of the right side groove 16 is communicated with an annular inner groove 27 of the graphite sealing ring 4, and the orientation of the head region 17 of each anti-fishbone dynamic pressure groove 14 is opposite to the rotation direction omega of the rotating shaft.
As shown in fig. 4 and 5, in the bearing cavity non-contact graphite sealing structure of the present invention, at least one ring of fishbone-shaped dynamic pressure grooves 20 which are uniformly spaced in the circumferential direction and have the same orientation is formed on the outer circumferential surface of the sealing track 3, and the fishbone-shaped dynamic pressure grooves 20 are axially disposed corresponding to the anti-fishbone-shaped dynamic pressure grooves 14 disposed on the graphite sealing ring 4, each fishbone-shaped dynamic pressure groove 20 includes a left side groove 21 and a right side groove 22 which are communicated with each other and have an included angle, and each anti-fishbone-shaped dynamic pressure groove 20 includes a head region 23, a middle region 24 and a tail region 25, and the head region 23 of each fishbone-shaped dynamic pressure groove 20 is oriented in the same direction Ω of rotation of the rotating shaft 1.
In the operation process of an aircraft engine, a certain amount of lubricating oil 13 is needed for lubricating and cooling a bearing 11 in a bearing cavity 10, in order to prevent the lubricating oil 13 from leaking, a sealing cavity 2 is arranged outside the bearing cavity 10, and sealing is carried out by introducing a sealing gas 12 with higher pressure into the sealing cavity 2. When the rotating shaft 1 rotates, a sealing friction surface is formed between the graphite sealing ring 4 and the sealing track 3, and the lubricating oil is prevented from leaking.
When the engine runs stably, because the auxiliary sealing surface 28 of the graphite sealing ring 4 is provided with the anti-fishbone dynamic pressure groove 14, the tail area of the left side groove of the anti-fishbone dynamic pressure groove 14 is communicated with the sealing cavity 2, and the tail area of the right side groove is communicated with the annular inner groove 27, the contact area between the graphite sealing ring 4 and the runway 3 is reduced, and the graphite sealing ring 4 and the sealing runway 3 tend to be in non-contact.
When the engine runs stably, the fishbone-shaped dynamic pressure groove 20 is formed in the outer circumferential surface of the sealing runway 3, so that the contact area between the graphite sealing ring 4 and the sealing runway 3 is reduced, and the graphite sealing ring 4 and the sealing runway 3 tend to be in non-contact.
When the engine runs stably, because the counter-fishbone-shaped dynamic pressure groove 14 is formed in the secondary sealing surface 28 of the graphite sealing ring 4, the graphite sealing ring 4 tends to be separated from the sealing runway 3 under the supporting action of the pressure in the counter-fishbone-shaped dynamic pressure groove 14, so that the graphite sealing ring 4 and the sealing runway 3 tend to be in non-contact.
When the engine runs stably, because the fishbone dynamic pressure groove 20 is arranged on the outer circumferential surface of the sealing runway 3, the graphite sealing ring 4 has a tendency to be separated from the sealing runway 3 under the supporting action of the pressure in the fishbone dynamic pressure groove 20, so that the graphite sealing ring 4 and the sealing runway 3 tend to be in non-contact.
As shown in FIG. 3, the secondary sealing surface 28 of the graphite seal ring 4 is provided with a dynamic pressure generating groove 14 of a reverse fishbone shape having a width t1Typically 0.5mm, depth h1Generally, 0.4mm is taken, the radius R of the head 17 of the inverse fishbone dynamic pressure groove 141Generally 1mm is taken, the tail part 19 of the anti-fishbone dynamic pressure groove 14 is generally communicated with the outside, the middle part 18 of the anti-fishbone dynamic pressure groove 14 is generally a straight groove, and the included angle alpha between the left side groove 15 and the right side groove 16 of the anti-fishbone dynamic pressure groove 141Typically 150 deg. is taken. As shown in FIG. 6, the included angle β of every two anti-fishbone dynamic pressure grooves 141Is 5 deg..
As shown in fig. 4, the circumferential surface of the sealing track 4 is provided with a fishbone-shaped dynamic pressure groove 20 having a width t2Typically 0.2mm, depth h2Generally, 0.02mm is taken, the radius R of the head 23 of the fishbone dynamic pressure groove 20 is21Typically 4mm, tail 25 radius R22Generally 1mm is taken, the middle part 24 of the fishbone-shaped dynamic pressure groove 20 is a generally straight groove, and the included angle alpha between the left side groove 21 and the right side groove 22 of the fishbone-shaped dynamic pressure groove 202Typically 120 deg. is taken. As shown in FIG. 6, the included angle β of every two fishbone dynamic pressure grooves 202Is 12 deg..
According to the invention, through CFD and experimental verification, under the condition of the same oil supply amount, the graphite sealing effect through non-contact design is improved by 15-30% compared with that of the traditional graphite sealing effect, the highest operation linear speed is improved by 20-30%, and the predicted operation life is improved by 40-50%.
The objects of the invention are fully effectively attained by the above discussion. Generally, the width t of the inverted fishbone-shaped dynamic pressure groove formed on the inner circumferential surface of the graphite sealing ring pair seal10.4-1 mm, depth h1Between 0.3 mm and 0.6mm, radius R of head1At 1-6 mm, the tail part is directly communicated with the outside, the middle part can be a straight groove or a curved groove, and the included angle alpha between the left side groove and the right side groove1Between 100 degrees and 170 degrees, the included angle beta of every two inverse fishbone dynamic pressure grooves1Is 3-8 degrees. Fishbone-shaped dynamic pressure groove width t formed on outer circumferential surface of sealing track20.1-0.6 mm, depth h2Between 0.01 mm and 0.1mm, radius R of head21At 2-6 mm, tail radius R22At 0.5-3 mm, the middle part can be a straight groove or a curved groove, and the included angle alpha between the left side groove and the right side groove2Between 90 degrees and 150 degrees, the included angle beta of every two inverse fishbone dynamic pressure grooves2Is 5-12 degrees.
The graphite sealing non-contact design comprises that the inner circumferential surface of the graphite sealing ring pair seal is provided with a reverse fishbone-shaped dynamic pressure groove and the outer circumferential surface of the runway is provided with a fishbone-shaped dynamic pressure groove, the shape, the number, the arrangement mode and the like of the corresponding dynamic pressure grooves can be changed, and any modification which does not deviate from the function and the structural principle of the invention is included in the scope of the claims.
The object of the present invention is fully effectively achieved by the above embodiments. Those skilled in the art will appreciate that the present invention includes, but is not limited to, what is described in the accompanying drawings and the foregoing detailed description. While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications within the spirit and scope of the appended claims.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010842892.5A CN111927634B (en) | 2020-08-20 | 2020-08-20 | Bearing chamber non-contact graphite sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010842892.5A CN111927634B (en) | 2020-08-20 | 2020-08-20 | Bearing chamber non-contact graphite sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111927634A CN111927634A (en) | 2020-11-13 |
| CN111927634B true CN111927634B (en) | 2022-03-29 |
Family
ID=73304916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010842892.5A Active CN111927634B (en) | 2020-08-20 | 2020-08-20 | Bearing chamber non-contact graphite sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111927634B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115614109B (en) * | 2022-10-13 | 2024-05-17 | 中国航发四川燃气涡轮研究院 | Negative pressure-resistant circumferential graphite sealing structure |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59159416A (en) * | 1983-02-25 | 1984-09-10 | Matsushita Electric Ind Co Ltd | Hydrodynamic bearing device |
| JPH11223214A (en) * | 1998-02-05 | 1999-08-17 | Koyo Seiko Co Ltd | Bearing device |
| JP4941156B2 (en) * | 2007-07-30 | 2012-05-30 | 日本電産株式会社 | Fluid dynamic bearing device, spindle motor, and disk drive device |
| CN101469771B (en) * | 2007-12-26 | 2010-12-29 | 丹东克隆集团有限责任公司 | Bidirectionally rotary cascade arc groove mechanical sealing end-face |
| KR101153546B1 (en) * | 2010-10-11 | 2012-06-12 | 삼성전기주식회사 | Motor and driving device of recording disk including the same |
| CN109578587B (en) * | 2017-09-29 | 2020-06-02 | 中国航发商用航空发动机有限责任公司 | Circumferential graphite seal assembly for sealing a bearing cavity |
-
2020
- 2020-08-20 CN CN202010842892.5A patent/CN111927634B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111927634A (en) | 2020-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7984911B2 (en) | Face seal for gas turbine engine | |
| CN111927635B (en) | Graphite sealing structure with twill dynamic pressure groove | |
| EP2224103B1 (en) | Bearing support apparatus with squeeze film damper | |
| JP3555683B2 (en) | Seal assembly for rotating machine | |
| US7997802B2 (en) | Axial plain bearing assembly | |
| US11111789B2 (en) | Vane-type air motor | |
| JP2001012610A (en) | Face seal structure | |
| CN111998075B (en) | Sealing structure suitable for engine bearing cavity | |
| JP2018532085A (en) | Gas bearings or related improvements | |
| CN106285957B (en) | Pre- seal structure | |
| CN113028067B (en) | Adaptive labyrinth seal for high-speed shafts | |
| EP2787257B1 (en) | Fluid transfer seal assemblies, fluid transfer systems, and methods for transferring process fluid between stationary and rotating components using the same | |
| CN108317164B (en) | Combined bearing and seal assemblies for rotating shafts | |
| CN111927634B (en) | Bearing chamber non-contact graphite sealing structure | |
| CN113551039A (en) | Self-adaptive graphite sealing structure for intermediate bearing cavity of aircraft engine | |
| CN107084244B (en) | Comb tooth and floating ring combined sealing structure | |
| CN110094236A (en) | A kind of helium turbine shaft architecture | |
| CN114215916B (en) | A air film seal structure for aeroengine main bearing chamber | |
| CN111927633B (en) | A graphite sealing structure with reverse fishbone type dynamic pressure groove | |
| CN221921080U (en) | Graphite sealing structure with tree-shaped micro-texture and sealing runway | |
| CN118482182A (en) | An adaptive inverted interaxial air film seal structure based on negative Poisson's ratio metamaterial | |
| CN110439631A (en) | It is a kind of can active clearance control labyrinth seal structure | |
| CN107061740B (en) | A mechanical seal structure with honeycomb-shaped grooves on the cylindrical surface | |
| CN212407566U (en) | Rotary vane type high-temperature high-pressure gas or liquid elastic contact dynamic sealing device | |
| CN111306304B (en) | A rotary plate type high temperature and high pressure gas (liquid) elastic contact dynamic sealing device and preparation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |